arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.01767astro-ph.SR
收藏

振荡食双星AS Eri的更新模型和精确绝对参数

Updated modelling and refined absolute parameters of the oscillating eclipsing binary AS Eri

P. Lampens, D. Mkrtichian, H. Lehmann, K. Gunsriwiwat, L. Vermeylen, J. Matthews, R. Kuschnig

摘要:

我们提出了一个新的研究的Algol型食双星系统AS Eri的MOST和TESS光变曲线的组合和收集非常精确的径向速度与光谱仪HERMES在墨卡托望远镜,拉帕尔马,TCES在阿尔弗雷德Jensch望远镜,陶登堡操作。它的主要成分是一颗A3 V型脉动、质量吸积的恒星。利用PHOEBE软件包对光场和速度场进行拟合,确定了采用半分离系统结构的最佳拟合模型。使用最近的(O-C)分析和在两个光变曲线之间检测到的相移值2.6641496 $\pm$ 0.000001天,轨道周期得到了改进。在(O-C)残差中没有任何周期变化证实了轨道周期的长期稳定性。此外,我们表明,每个光变曲线分别导出的模型需要小的差异,例如,在温度参数T $_{\rm eff,2}$。新的解决方案的高质量的残差说明。我们获得了以下绝对组件参数:L $_1$ = 14.125~L $_{\odot}$,M $_1$ = 2.014~M $_{\odot}$,R $_1$ = 1.733~R $_{\odot}$,log g $_1$ = 4.264,L $_2$ = 4.345~L $_{\odot}$,M $_2$ = 0.211~M $_{\odot}$,R $_2$ = 2.19~R $_{\odot}$,log g $_2$ = 3.078,T $_{\rm eff,2}$ /T $_{\rm eff,1}$ = 0.662 $\pm$ 0.002。虽然轨道周期似乎是稳定的长期,我们表明,光变曲线的形状是由一个长达数年的调制,这是最有可能是由于磁活动的冷同伴的影响。

英文摘要:

We present a new study of the Algol-type eclipsing binary system AS Eri based on the combination of the MOST and TESS light curves and a collection of very precise radial velocities obtained with the spectrographs HERMES operating at the Mercator telescope, La Palma, and TCES operating at the Alfred Jensch telescope, Tautenburg. The primary component is an A3 V-type pulsating, mass-accreting star. We fitted the light and velocity data with the package PHOEBE, and determined the best-fitting model adopting the configuration of a semi-detached system. The orbital period has been improved using a recent (O-C) analysis and the phase shift detected between both light curves to the value 2.6641496 $\pm$ 0.0000001 days. The absence of any cyclic variation in the (O-C) residuals confirms the long-term stability of the orbital period. Furthermore, we show that the models derived for each light curve separately entail small differences, e.g. in the temperature parameter T$_{\rm eff,2}$. The high quality of the new solutions is illustrated by the residuals. We obtained the following absolute component parameters: L$_1$ = 14.125~L$_{\odot}$, M$_1$ = 2.014~M$_{\odot}$, R$_1$ = 1.733~R$_{\odot}$, log g$_1$ = 4.264, L$_2$ = 4.345~L$_{\odot}$, M$_2$ = 0.211~M$_{\odot}$, R$_2$ = 2.19~R$_{\odot}$, log g$_2$ = 3.078~ with T$_{\rm eff,2}$/T$_{\rm eff,1}$ = 0.662 $\pm$ 0.002. Although the orbital period appears to be stable on the long term, we show that the light-curve shape is affected by a years-long modulation which is most probably due to the magnetic activity of the cool companion.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑